<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>my css</title>
    <style>
        * {
            font-family: Monospace Fantasy;
        }
        body {
            background-color: silver;
        }
        h1 {
            text-align: center;
            background-color: orange;
        }
        .c1 {
            color: darkcyan;
        }
        .c2 {
            font-weight: bold;
        }
        p.c2 {
            text-decoration: underline;
        }
        p .c2 {
            text-decoration: underline;
        }
        #id1 {
            font-style: italic;
        }
        #id1, .c2 {
            border: 2px solid green;
        }
        a:link {    /*访问前（历史记录中没有）的样式*/
            text-decoration: none;
        }
        a:visited {   /*访问后（历史记录中有）的样式*/
            color: darkgoldenrod;
        }
        a:hover {   /*鼠标悬停时的样式*/
            font-size: 1.2em;  /*文字大小为原来的1.2倍*/
        }
    </style>
</head>
<body>
<h1>达内云计算 cloud computing</h1>
<hr>
<div><a href="http://www.tom.com" target="_blank">tom在线</a></div>

<p class="c1">达内云计算 cloud computing</p>
<p>达内云计算 <span class="c1">cloud computing</span></p>
<p class="c2">达内云计算 cloud computing</p>
<p>达内云计算 <span class="c2">cloud computing</span></p>
<div class="c2">达内云计算 cloud computing</div>
<div id="id1">达内云计算 cloud computing</div>
<div>达内云计算 cloud computing</div>
<div>达内云计算 cloud computing</div>
<div>达内云计算 cloud computing</div>
<div>达内云计算 cloud computing</div>
</body>
</html>